Numerical Whirl–Flutter analysis of a tiltrotor semi-span wind tunnel model

Cocco, Alessandro; Mazzetti, Stefano; Masarati, Pierangelo; Hoff, Stefan van’t; Timmerman, Bart

doi:10.1007/s13272-022-00605-2

Cited by 9 publications

(3 citation statements)

References 37 publications

(43 reference statements)

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“…ATTILA model, an example of a real-life application of Blendyn, is shown in Fig . 2 [17]. C. OpenFOAM OpenFOAM (Open Field Operation And Manipulation) is a C++ toolbox for the development of customized numerical solvers, and pre-/post-processing utilities for the solution of continuum mechanics problems, most prominently including computational fluid dynamics (CFD) [20].…”

Section: B Integration Of Mbdyn To Other Softwaresmentioning

confidence: 99%

Computer Modeling and Simulation of Mechanisms Using Free and Open-Source Software

Zagorski,

Miltchev,

Semkov

2024

ETR

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The present paper aims to examine how free and open-source software (FOSS) can be applied in the processes of computer modeling and simulations of mechanisms. Successful examples of the application of free software for CAD (computer-aided design) and simulation of mechanisms are presented and discussed. A case study is used to exemplify how engineering tasks, related to position function determination, first transfer function and output link’s velocity of a four-bar linkage, can be resolved with the help of an open-source scientific programming language – GNU Octave. Recommendations about the applicability of free open-source software in mechanism analysis are provided.

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Section: B Integration Of Mbdyn To Other Softwaresmentioning

confidence: 99%

Computer Modeling and Simulation of Mechanisms Using Free and Open-Source Software

Zagorski,

Miltchev,

Semkov

2024

ETR

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“…Throughout the project several methods for determining the whirl flutter characteristics of the ATTILA testbed have been investigated, particularly in MBDyn [25]. In FLIGHTLAB the default methodology relies on direct linearization by numerical perturbation of the state equations, providing information on both wing-pylon and rotor modes.…”

Section: Whirl Flutter Predictionsmentioning

confidence: 99%

“…The testbed is designed to enable testing in air in the DNW Large Low-speed Facility (LLF) in the 6 m × 6 m test section, as well as in heavy-gas at Mach-scaled conditions in the NASA Transonic Dynamics Tunnel (TDT) at some future date. Preliminary numerical modelling efforts and related aeroelastic stability predictions are presented in [23][24][25]. The current paper provides more details about the design and intended usage of the ATTILA testbed, and presents updated pre-test numerical aeroelastic stability predictions obtained using the multibody dynamics models developed within the project.…”

Section: Introductionmentioning

confidence: 99%

Design of a Tiltrotor Semi-Span Wind Tunnel Model for Whirl Flutter Investigations

Hoff

Vilsteren

Cocco

et al. 2023

AIAA SCITECH 2023 Forum

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The Clean Sky 2 Advanced Testbed for TILtrotor Aeroelastics (ATTILA) project is aimed at the design, manufacturing and testing of a semi-span aeroelastic wind tunnel model of the Next Generation Civil TiltRotor (NGCTR). This paper provides a description of the ATTILA tiltrotor whirl flutter testbed design, as well as the design and test methodology and associated numerical modelling. In advance of the first wind tunnel test entry, the design activities rely on multi-level code-to-code validation as presented herein to improve confidence in the flutter predictions. The available numerical tools have been used to tailor the design to the desired flutter characteristics in the presence of the limitations associated with testing in Froude-scale conditions. Robustness of the predictions and design is investigated through parametric variations associated with modelling assumptions and design features. Finally, an outlook on the future dynamic characterization and wind tunnel test activities is provided.

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Rotorcraft stability analysis using Lyapunov characteristic exponents estimated from multibody dynamics

Cassoni,

Cocco,

Tamer

et al. 2024

CEAS Aeronaut J

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Stability analysis of complex, nonlinear dynamical systems is a challenge. The use of Lyapunov Characteristic Exponents through a Jacobian-less method is proposed as a means to identify the Maximum Lyapunov Characteristic Exponent, namely the fundamental stability indicator of a generic problem, solely from time series obtained through general-purpose multibody dynamics simulations of complex rotorcraft aeromechanics models. The method is first applied to a relatively simple scenario concerning the identification of ground resonance. Then, its application to more complex models is addressed by studying the aeroelastic stability and identifying the whirl flutter of the XV-15 tiltrotor using a comprehensive aeroelastic model.

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Numerical Whirl–Flutter analysis of a tiltrotor semi-span wind tunnel model

Cited by 9 publications

References 37 publications

Computer Modeling and Simulation of Mechanisms Using Free and Open-Source Software

Computer Modeling and Simulation of Mechanisms Using Free and Open-Source Software

Design of a Tiltrotor Semi-Span Wind Tunnel Model for Whirl Flutter Investigations

Rotorcraft stability analysis using Lyapunov characteristic exponents estimated from multibody dynamics

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